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17 results for “Microbial carbon use efficiency”
Effects of Soil Warming and Substrate Complexity on Microbial Carbon Use Efficiency at Harvard Forest 2017
Soil microbial carbon use efficiency (CUE) is a combination of growth and respiration, which may respond differently to climate change depending on physical protection of soil carbon (C) and its availability to microbes. In a mid-latitude hardwood forest in central Massachusetts, 27 years of soil warming (+5 ◦C) has resulted in C loss and altered soil organic matter (SOM) quality, yet the underlying mechanisms remain unclear. Here, we hypothesized that long-term warming reduces physical aggregate protection of SOM, microbial CUE, and its temperature sensitivity. Soil was separated into macroaggregate (250–2000 μm) and microaggregate (less than 250 μm) fractions, and CUE was measured with 18O-enriched water in samples incubated at 15 and 25 ◦C for 24 h. We found that long-term warming reduced soil C and nitrogen concentrations and extracellular enzyme activity in macroaggregates, but did not affect physical protection of SOM. Long-term warming showed little effect on CUE or microbial biomass turnover time because it reduced both growth and respiration. However, CUE was less temperature sensitive in macroaggregates from the warmed compared to the control plots. Our findings suggest that microbial thermal responses to long-term warming occur mostly in soil compartments where SOM is less physically protected and thus more vulnerable to microbial degradation.
Data for 'Microbial carbon use efficiency along an altitudinal gradient'
<p>This dataset is related to the manuscript “Microbial carbon use efficiency along an altitudinal gradient“ by Kevin Mganga, Outi-Maaria Sietiö, Nele Meyer, Christopher Poeplau, Sylwia Adamczyk, Christina Biasi, Subin Kalu, Matti Räsänen, Per Ambus, Hannu Fritze, Petri Pellikka, and Kristiina Karhu.</p> <p>Corresponding author: Outi-Maaria Sietiö (<a href="mailto:outi-maaria.sietio@helsinki.fi">outi-maaria.sietio@helsinki.fi</a>)</p>
Dataset for microbial community and carbon use efficiency determined under SPP project- CueNosc
<p>This dataset encapsulates molecular and biothermal data derived from the CueNosc sub-project, which operates under the umbrella of the German research initiative "SoilSystems: Systems Ecology of Soils – Energy Discharge Modulated by Microbiome and Boundary Conditions." This initiative is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) as part of the priority program 2322.</p> <p>We carried out a microcosm incubation experiment utilizing both intact soil samples and soil-free microbial cell extracts (SFCE). The primary aim was to assess the impact of various carbon substrates—including glucose, glutamine, glycerol, and citric acid—on microbial communities' dynamic and their carbon use efficiency (CUE). The data collected includes detailed analyses of microbial community composition at the phylum level and CUE values. Carbon use efficiency was obtained by calculating the calorespirometric ratio (metabolic heat production to respiration).</p> <p> </p>
Productivity-driven decoupling of microbial carbon use efficiency and respiration across global soils
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Data from: Microbial carbon use efficiency and soil organic carbon stocks across an elevational gradient in the Peruvian Andes
<p>Soils of mountain ecosystems are one of the most vulnerable ecosystems to climate change, while the ecosystem services they produce are significant and currently at risk. High altitude soils contain high C stocks, but due to difficult access to sites these areas are understudied. Moreover, how the C and N cycling is changing in response to climate change in these ecosystems, is still unclear. Microbial carbon use efficiency (CUE) and its dependency on the environmental constraints along the altitudinal gradients is one important unknown factor. Here we present results from an altitudinal gradient study (3500 to 4500 m a.s.l.) from a Polylepis forest in the Peruvian Andes. We measured the soil organic carbon (SOC) stocks and microbial metabolic CUE by <sup>13</sup>C glucose tracing and microbial resource use efficiency (CUE<sub>C</sub><sub>:</sub><sub>N</sub>) based on enzyme activity measurements. We expected to find an increase in SOC stock, microbial nutrient limitations, and lower CUE with elevation. SOC stocks depended on soil development and followed a unimodal curve that peaks at 4000 m in two of the three studied valleys. Neither <sup>13</sup>CUE nor CUE<sub>C:N</sub> changed significantly with altitude. Soil C:N ratio, β-glucosidase, chitinase, and phosphatase enzyme activities increased with elevation, but peroxidase activity decreased with elevation. We suggest that more labile organic matter left at high elevation could compensate for the increasing nutrient limitation at high elevation, resulting in no noticeable change in CUE with elevation.</p>
Deforestation for agriculture increases microbial carbon use efficiency in subarctic soils
<p>This repository contains all necessary raw data as well as the R code used to conduct statistical analysis and create figures of the publication</p><p> </p><p><strong>Deforestation for agriculture increases microbial carbon use efficiency in subarctic soils</strong></p><p>Julia Schroeder1, Tino Peplau1, Frank Pennekamp2, Edward Gregorich3, Christoph C. Tebbe4, Christopher Poeplau1</p><p>1 Thünen Institute of Climate-Smart Agriculture, Bundesallee 68, 38116 Braunschweig, Germany</p><p>2 Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland</p><p>3 Research and Development Centre, Central Experimental Farm, Agriculture and Agri-Food Canada, 960 Carling Ave, Ottawa, Ontario K1A 0C6, Canada</p><p>4 Thünen Institute of Biodiversity, Bundesallee 65, 38116 Braunschweig, Germany</p><p>DOI: https://doi.org/10.1007/s00374-022-01669-2 </p><p>This study investigated how and through which pathways deforestation and conversion to agricultural land (i.e. grassland, cropland) alters the microbial carbon use efficiency (CUE) in subarctic soils to allow the development of mitigation strategies to alleviate C losses. We assessed CUE using 18O-labelled water in a paired-plot approach on soils collected from 19 farms across the subarctic region of Yukon, Canada, comprising 14 pairs of forest-to-grassland conversion and 15 pairs of forest-to-cropland conversion. Microbial CUE significantly increased following conversion to grassland and cropland. Land-use conversion resulted in a lower estimated abundance of fungi, while the archaeal abundance increased, as assessed by qPCR. Interestingly, structural equation modelling revealed that increases in CUE were mediated by a rise in soil pH and a decrease in soil C:N ratio rather than by shifts in microbial community composition, i.e. the ratio of fungi, bacteria and archaea. Our findings indicate a direct control of abiotic factors on microbial CUE via improved nutrient availability and facilitated conditions for microbial growth.</p><p>The R code was developed under R v3.6.3 and adapted to work under version R v.4.1.2.</p><p>The repository includes the following files:</p><ul><li>general_soil_parameters_per_site.csv - general soil data assessed on pooled reference forest plot (n=19)</li><li>general_soil_parameters_per_plot.csv - general soil data assessed on pooled replicated field samples (n=48)</li><li>sample_data.csv - data measured for each laboratory sample (n=147)</li></ul><p> </p><ul><li>Land-use change effects on 18O-CUE.Rproj - Rproject (load project to work on provided scripts and data)</li><li>load_data_script.R - loads required data</li><li>Multivariate_normality_script.R - tests for multivariate normaility in dataset</li><li>PCA_script.R - calculates PC1 and 2 of clay mineralogy data to reduce dimensions</li><li>map_Yukon_script.R - create Figure 1</li><li>plot_density_script.R - create Figure 2</li><li>linear_mixed-effects_models_script.R - calculates response ratios</li><li>plot_boxplots_script.R - plot boxplots per land use including compact letter display indicating significant differences, create Figure 3 + 4</li><li>correlogram_script.R - correlation analysis to identify drivers of CUE, create Figure 6</li><li>plot_correlations_script.R - plot drivers of CUE, create Figure 5 + 7</li><li>SEM_script.R - development of structural equation model, create Figure 8</li></ul>
Long-term warming of a forest soil reduces microbial biomass and its carbon and nitrogen use efficiencies
<p>Global warming impacts biogeochemical cycles in terrestrial ecosystems, but it is still unclear how the simultaneous cycling of carbon (C) and nitrogen (N) in soils could be affected in the longer-term. Here, we evaluated how 14 years of soil warming (+4°C) affected the soil C and N cycle across different soil depths and seasons in a temperate mountain forest. We used H<sub>2</sub><sup>18</sup>O incorporation into DNA and <sup>15</sup>N isotope pool dilution techniques to determine gross rates of C and N transformation processes. Our data showed different warming effects on soil C and N cycling, and these were consistent across soil depths and seasons. Warming decreased microbial biomass C (−22%), but at the same time increased microbial biomass-specific growth (+25%) and respiration (+39%), the potential activity of β-glucosidase (+31%), and microbial turnover (+14%). Warming reduced gross rates of protein depolymerization (−19%), but stimulated gross N mineralization (+63%) and the potential activities of N-acetylglucosaminidase (+106%) and leucine-aminopeptidase (+46%), and had no impact on gross nitrification (+1%). Microbial C and N use efficiencies were both lower in the warming treatment (−15% and −17%, respectively). Overall, our results suggest that long-term warming drives soil microbes to incorporate less C and N into their biomass (and necromass), and to release more inorganic C and N to the environment, causing lower soil C and N storage in this forest, as indicated by lower soil C and total N contents. The decreases in microbial CUE and NUE were likely triggered by increasing microbial P constraints in warmed soils, limiting anabolic processes and microbial growth and promoting pervasive losses of C and N from the soil.</p>
Long-term warming of a forest soil reduces microbial biomass and its carbon and nitrogen use efficiencies
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Data from: Microbial carbon use efficiency and soil organic carbon stocks across an elevational gradient in the Peruvian Andes
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Lithological controls on soil geochemistry regulate microbial carbon use efficiency and carbon storage
<p><span>The data supporting the findings of the study titled "Lithological controls on soil geochemistry regulate microbial carbon use efficiency and carbon storage". lithology mediates the effects of soil aggregates and minerals on microbial carbon use efficiency and microbial necromass stability. Furthermore, despite high mineral abundance reduced microbial carbon use efficiency, it enhanced microbial necromass stabilization through organo-mineral associations.</span></p>
The effect of plant invasion on soil microbial carbon-use efficiency in semiarid grasslands of the Rocky Mountain West
<p>1. Grassland ecosystems invaded by exotic plant species often exhibit substantially higher aboveground productivity and soil nitrogen (N) than the native communities they replace. These shifts are likely associated with altered microbial carbon (C) and N cycling, but we know surprisingly little about how these processes change with plant invasion.</p> <p>2. Targeting four invasive plant species common in the Rocky Mountain West, we collected soils from invaded and adjacent uninvaded grassland field plots, as well as from an experimental garden. We used a laboratory incubation of soils with <sup>13</sup>C- and <sup>15</sup>N-labelled substrates to examine how microbial C respiration, C assimilation, and N cycling differed among plant communities. To assess how these rates corresponded with plant productivity and microbial communities, we measured aboveground plant biomass and characterized bacterial and fungal communities using Illumina sequencing.</p> <p>3. In the paired observational plots, soil microbial communities associated with invaders generally had higher respiration rates and lower growth rates than those associated with the native plant communities, leading to a lower microbial carbon-use efficiency (CUE). Overall, soil substrate with a lower C:N was related to decreased CUE, and lower CUE was related to increased gross and net N mineralization. In turn, faster gross N mineralization was related to greater aboveground biomass. These patterns coincided with significant differences in fungal communities, whereas bacterial communities varied by site. Invasive plants also altered microbial communities in the experimental plots, but this was not associated with shifts in microbial CUE, which was low overall.</p> <p>4. <i>Synthesis.</i> Our results provide evidence that invasive plants alter bacterial and fungal communities. These shifts were not associated with changes in microbial CUE and, thus, the often-assumed link between compositional and functional shifts was not apparent in this study. However, lower CUE was associated with elevated rates of N cycling and productivity, which, in low-productivity systems, could help explain the increased growth and success of exotic plant invaders.</p>
Temperature Controls the Relation between Soil Organic Carbon and Microbial Carbon Use Efficiency
<p>This is the dataset for the manuscript entitled "Temperature controls the relation between soil organic carbon and microbial carbon use efficiency".</p>
Data covering soil microbial carbon use efficiency and soil properties along an aridity gradient
<p>Data including experiment description, site geographic location, climate variables, soil microbial carbon use efficiency and soil properties along an aridity gradient.</p>
The effect of plant invasion on soil microbial carbon-use efficiency in semiarid grasslands of the Rocky Mountain West
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Data from: Differences in the soil microbial community and carbon use efficiency following development of Vochysia guatemalensis tree plantations in unproductive pastures in Costa Rica
This study shows that Vochysia guatemalensis tree plantations were associated with enhanced soil biotic and abiotic characteristics in previously cleared forests in the Northern Zone of Costa Rica, suggesting the possible use of this practice as a restoration strategy for local land owners. Soil samples from a primary forest (PF), secondary forest (SF), and a 13-year-old (OV) plantation of V. guatemalensis had greater relative abundances of DNA sequences of microbial genera critical for C-use efficiency (i.e., the saprobe, complex C and wood rot/lignin decomposer fungi, and bacterial lignin and other complex C degraders), and greater levels of total organic C, C-biomass, and Microbial Quotients as indicators of enhanced C-use efficiency, than found in soils of adjacent 5-year-old (NV) V. guatemalensis plantations and abandoned non-productive pasture/grasslands (GR). The major research conclusions were that: 1) conversion of forested land into abandoned pasture/grasslands decreased the C-use efficiency in the soils and the microbial groups associated with C-use efficiency; 2) soils in plantations of V. guatemalensis were associated with increased abundances of the DNA of these same microbial groups and enhanced C-use efficiency; 3) DNA-based taxonomic analysis of microbes and analysis of the Microbial Quotient values can be used to monitor soil ecosystems for assessment of the efficacy of restoration activities. Thus, planting V. guatemalensis on damaged lands in the Maquenque National Wildlife Refuge (MNWR) should be encouraged to provide a sustainable forestry crop that can be harvested rotationally, while improving soil ecosystem health and reducing the pressure to harvest other forest sites.
Microbial carbon use efficiency promotes global soil carbon storage
<p>This is the data for supporting the findings of the article "<em>Microbial carbon use efficiency promotes global soil carbon storage</em>" <a href="https://www.nature.com/articles/s41586-023-06042-3">https://www.nature.com/articles/s41586-023-06042-3</a></p>
Data from: Differences in the soil microbial community and carbon use efficiency following development of Vochysia guatemalensis tree plantations in unproductive pastures in Costa Rica
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